William w



(No Mod-e1.)

W. W. WALLACE.

PUG MILL.

No. 338,121. Patented Mar. 16, 1886.

UNITED STATES PATENT OFFICE.

\VILLIAM W. \VALLACE, OF FRANKFORT, INDIANA, ASSIGNOR TO THE XVALLACEMANUFACTURING COMPANY, OF SAME PLACE.

PUG-MILL.

SPEGIFICATION forming part of Letters Patent No.- 338,121 dated March16, 1886.

Application filed October 31, 1885. Serial No.18l,5"8. (No model.)

To all whom it may concern:

Be it known that I, WILLIAM WV. WALLAoE, a resident of Frankfort, in thecounty of Olin- Lou and State of Indiana, have invented certain new anduseful Improvements in Pug Mills, of which the following is aspecification.

My invention relates to an improved pugmill for grinding and mixingclay.

My invention relates to the method of constructing the mill.

It has, first, for its object the employment of a cone-shaped cylinder,in which the tempering-blades are worked, so as to get an increasedcompression upon the clay toward the discharge end of the cylinder as itis worked forward Another object of my invention is to set the bottomcone of the cylinder at or near the horizontal plane, so that the'waterand clay will work forward easily by the pitch of the cone.

Another object of my invention is to provide break-pins for thestationary blades, to prevent damage being occasioned by theintroduction of hard foreign substancessuch as stones, wood, &c.-all ofwhich will be fully set forth in the description of the accompanyingdrawings, making a part of this specification, in which- Figure 1 is aside elevation of my improvement; Fig. 2, a horizontal central sectionof the cylinder; Fig. 3,asection on line mw,Fig. 1.

A represents the bed-plate of the frame on which the pug-mill ismounted.

B represents the driving-wheel mounted on shaft D.

0 represents a spur-gear meshing and driving the bevel-gear D,which ismounted on pugmill shaft a. This shaft is journaled in boxing 0 d e. Thejournal-box e is suspended within the cone-cylinder G at its smaller endon spider-arms '6.

1 represents wiper blades set flatwise in shaft a, as shown in Fig. 2.

2 2 represent mixing-blades set edgewise.

3 represents another set of wide blades placed beveling, so as to forcethe clay forward to the discharge end of the cylinder.

The blades 1 and 2 may be set at any desired angle for wiping or forcingthe clay forward.

By the use of the cone-cylinder G a less angle or pitch-of the bladeswill be required to move the clay forward in the cylinder.

The wide and narrow blades are set alternately.

i represents cleaner-teeth, through which. the mixing-blades 1 2 3 passto break and mix the clay.

Great diliiculty has been experienced in the use of cleaner teeth, owingto their being broken by the presence of stones or other hard foreignsubstances in the clay.

In order to avoid the necessity of taking the machine apart, caused bythe breakage of the cleaner-teeth and mixing-blades, I have devised thefollowing means:

E represents a recess or enlargement of the cylinder above the pointwhere the cleanerfingers 4 are hung. These fingers are hung on apivot-rod, 5. (Shown in Fig. 2.)

6 represents projections or cars attached to the cylinder, and extendingdownward from the cylinder.

7 represents a break-pin inserted in the end of the cleaner-fingersoutside of the cylinder and resting on the ears 6. This pin holds thefingers 4- from turning and normally in working position; but when hardsubstances are forced against the cleaner-teeth the pin 7 will break,being the weakest, and allow the teeth 4 to turn on their pivot 5 andpass up into the space E, as shown in Fig. 3, out of the way of foreignsubstances. As soon as the foreign substance has passed through,thecleaner-fingers are brought back into position and a new break-pininserted. This avoids taking the mill apart to remove such substances,as they will be carried out the discharge end without breaking thecleaner-fingers and wipers.

F represents the hopper, through which the clay is fed into thecylinder.

The mill is shown with a round orifice, such as is usually employed withtile-mills; but it is obvious that the die or discharge end may besquare or any other desired form or shape, and it is adapted to pug clayfor tile or brick.

8 represents the usual anger on the discharge end of the shaft forforcing the clay out of the orifice 9.

The mill is constructed, preferably, by making the shaft a square andhaving the wiperarms 1 2, 850. They may be bolted, riveted, or cast on ahub, as shown in section, Fig. 3.

The cylinder G of the mill is set on a frame so that the bottom line orplane is at or near the horizontal, as shown in elevation, Fig. 1, andthe axis of the shaft inclines to the horizon. This is done to avoid thetendency of the clay and water to work backward,which would occur if theshaft were on a horizontal plane. It also assists in forcing the clayforward, and requires less driving-power.

I have found by experience this mill to be very efficient and moredurable than the ordinary pug-mill hitherto employed.

It is obvious that the recess E and cleanerfingers 4. could be used witha plane as well as with a conical-shaped cylinder. It is also ob viousthat the cleaner-fingers 4 could be used with a less degree ofefficiency without the recess E, and I desire to claim them in all formsherein expressed.

cylinder and discharging it through the smaller end, substantially asspecified.

2. In combination with the cylinder of a pug mill, the cleaner fingers4., projecting through said cylinder and hinged on a pivot, withbreak-pins arranged outside of the cylinder to hold them normally inworking position, substantially as specified.

3. In combination with the cylinder of a pug-mill, the recess E andcleaner-fingers 4, pivoted at the under side of said recess,projectingthrough the cylinder, and held normally in working position by abreak-pin which will yield to foreign substances and allow the fingersto pass in the recess out of the way of the tempering-blades,substantially as specified.

4:. In combination with a cone-cylinder provided with a recess, E,temperingfingers 4, pivoted to the cylinder and projecting through saidcylinder, and provided with break-pins for holding them normally inworking position, y

substantially as specified.

In testimony whereof I have hereunto set my hand.

7 WILLIAM IV. XVALLAOE.

lVit-nesses:

S. O. BOOKER, ELI MARVIN.

